i don't know if this is the correct place to do this but the second listed 'Sports' quiz of January 2016, has Sir Viv Richards as the only person to play in both Cricket & Football World Cups. He is supposed to have played for 'Antigua & Barbuda' in the qualifying stages of the 1974 Soccer World Cup but in an entry on his Wikipedia page it is stated that "he does not appear in recorded line ups."